Dahlia Circle/Donut/Coin Jade Pendant Necklace Genuine Certified Grade A Jadeite, 12" to 24" Cord Valuable and Safe-to-wear: Jadeite jade is rarer and more expensive than Nephrite, and its value increases overtime. Grade A means the jade is NOT treated by chemicals, thus is safe for your skin, compared to Grade B & C jade. Authenticity: Each piece comes with a certificate by China's National Testing Center which is more athoritative in certifying jade than G.I.A. of the U.S.A. The certificate can be verified online instantly. Meaning: jadeite jade is believed to have healing power and wards off evil spirits. This Coin pendant is named Ping An Kou in Chinese, one of the most classic symbols that grants safety, harmony, and furtune to it's wearers. This Pendant is Unisex. Dimension: Due to the nature of jade, each piece varies slightly by design, size, weight, and color from the image. Please compare to the US quarter coin reference in the product picture. The necklace cord is adjustable from 12 to 24 inches. Warranty: Dahlia assures that we truthfully present the product information and its product authenticity and quality. Dahlia is located in NYC and happy to assist your questions and concerns via phone and email